chemistry enthapy

1.2 H2O2 (l) → 2H2O (l) + O2 (g)

. If ΔH for the reaction = -141.4 kJ, how much energy is released when 12.0 grams of H2O2 is decomposed?

2. NaOH (s) + CO2 (g) → Na2CO3 (s) + H2O (g). If ΔHrxn is –128 kJ, how much sodium hydroxide in grams is reacted to produce 25.0 kJ of heat?

3.Consider the reaction

2 Ca (s) + O2 (g) –> 2 CaO (s) ΔH = -1270 kJ

What is the heat change for 100.0 g of Ca reacting?

4.2 H2 (g) + C (s) –> CH4 (g) ΔH = ?

Find ΔH for this reaction if when 10.0 g of H2 reacts 197 kJ of heat is released.

5. 2 Na (s) + 2 H2O (l) –> 2 NaOH (aq) + H2 (g)

Using ΔHf values from the table on the first page, find ΔH for this reaction using Hess’s Law equation.

6. 2 NO (g) + O2 (g) –> 2 NO2 (g)

Using ΔHf values from the table on the first page, find ΔH for this reaction using Hess’s Law equation.

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